Coal-cutting machine.



No. 818,619. PATENTED APR. 24, 1906 A. H. GIBSON.

GOAL CUTTING MACHINE.

AAAAAAAAAA N I FILED NOV. 15.1905.

ARTHUR H. GIBSON, OF EASTON, PENNSYLVANIA, Assiot'oa T INGERSOLL-RAND COMPANY,

RATION OF NEW JERSEY.

COAL-CUTTI NG MACHI To alljwhom it mag concern: Be it known that I, AnrHUR H. GrBsoN, a subject of the King of Grreatv Britain, and a resident of Easton, in the county of Northampton and State of Penns lvania, have invented a new and useful mprovement in Coal-Cutting Machines, of which the follow-- in is a specification.

y invention relates to improvements .in coal-cutting machines, and-more particularly to certain improvements in the construction, form, and arrangement of the several parts of machine The object of this invention is to provide. an automatic governor for coal'cutting machines which'are operated by reciprocating or pulsating colulnns of air whereby the stroke of the piston when the cutter is not striking coal may be reduced. I p

In the accompanying drawings, Figure 1 represents the coal-cutting machine in connection with an electrically-driven airresser for o erating the same, the parts being shown:

in sic e elevation, partially brokenaway. Fig

2 is an ela'rged longitudinal central section through the machine, the piston being shown at the limit of its forward movement when the cutter is striking coall Fi 3=is 'a top lan viewof the machine, the va ve-chest being removed and a part of the cylinder being broken away to more clearly show the ar: rangement of the ports therein. Figs. '4: and 5 are end and longitudinal sectional views, on" an enlarged scale, of the governor-plunger;

and Fig. 6 is an enlar ed detail section show ing the governor chec -valve.

The cylinder of the coal-cutting machine is denoted by 1, which cylinder is surmoun ed by a valve-chest 2, This v'alvechest 2 is divided into front and rear chambers. 3 and 4 by 'a manually-operated valve 5, having a throu hort 6, wherebythe two chambers. may e rought into open communication with each other for throwing the machine out of operation. Flexible air-tubes and 8 lead from the front and rear chambers 3 and -4 of the valve-chest 2 to the front and rear ends-9 and 10 of the cylinder 1'1'o'f the air- .presser, which air-Presser in the present/in stance is shown as being driven from the electric motor 12, the presser andits dliiflfi- 1e porta e motor being mounted on a suit b Specification of Letters Patent. application filed November 15. 1905. Serial No. 287.401

OF NEW YORK, N. 1:, ApoRPo- Patented April 24, 1906.

truck 13. The coalcuttin machine is mounted on suitable traction-wheels 14 and is provided with the usual handle 15 for guiding it into position for use. The cutter-piston .is denotedb 16 and its rod by 17.

Divide main front ports 18 lead from the front chamber? in the valve-chest to points a short distance to the rear of the front end of the cylinder-chamber. An auxiliary front port 19 leads from the front chamber 3 of the valve-chest to the extreme front end of the cylinder-chamber through a one-way valve 20, arranged to open by pressure from the close against pressure from the cylinderchamber in front of the piston 16'. p

A rear port 21 leads from the rear chamber 4 in the valve-chest to the/Cylinder-chamber a short distance from itsrear end. An auxiliary port 22 leads from the port 21 to a point closeto the rear end' of the cylinder-chamber through a one-way valve 23, which will open by pressure from the rear chamber .4 of the valve-chest and will close against pressure ton 16. 1 v

The governor for reducing thestroke of the piston 16 when, the cutter is not striking coal 1s constructed'and ar Ijan'ged as follows: The overnorlunger is denoted by 24., and it is front chamber 3 of the'valve-chest and to from the cylinder-chamber back of the pis fitted to s ide' in a cylindrical chamber 25 in the valve-chest 2. ,The mouths of the divided main front ports 18, which open into the front chamber 3, are also located in this {.cylindrical: chamber 25 in position to be '0 ened and closethb the slidlng lun er 24.

T e lun er is'guide in its forwar an back war slixfng movements by providing a stationary pin 26, carried by the valve-chest,

and side elongated slots 27 in the plunger.

The plunger is held normally at the limit ofits forward movement by providing the plun .25 in front of the plunport 32, which check-valve is arrang linderchamber to the forward end. of the governor check tvalve 33 is lodated the f i ed to ger with a longitudinal recess 28, in which a I open by pressure from 7 ports 18 at this point.

cylinder may slowly leak past the check-.

valve 33 back into the workcylinder.

The operation of the governor is as follows: When the cutter is striking coal, the piston 16 reaches the point shown in Fig. 2 at the limit of its forward movement. When the cutter does not strike coal, the piston 16 will continue its forward movement, thus overrunning the mouths of the ports 18 in the cylinder-chamber. The further forward movement of this piston 16 will force the air in front of the same through the port 32 and past the governor-valve 33 "into the chamber in front of the governor-plunger 24. This will force the governor-piston rearwardly against the tension of its spring 29 and cause the lunger to close the mouths of the divided mam front ports '18 in'the front chamber 3 of the valve chest, thus cutting off the divided main front \Vhen the column of air passes from the presser through the pipe 7 into the front chamber 3 for causing the return stroke of the piston, some of the same 'Will pass down through the auxiliary front port 19 and past the valve 20 into the cylinder-chamber in front of the piston 16. The air which passes in this manner will be only sufficient to move the piston rearwardly a part stroke. If the cutter on the next forward stroke of the work-piston strikes coal, the air will slowly leak past the governor check-valve 33, and thus permit the spring to slowly force the governor-plunger forwardly, and thus open the divided main ports 18, and thereby feed the full capacity of air to the I front of the piston 16 to cause it to resume its full working stroke. If, however, the cutter on the said next forward stroke fails to strike coal, the conditions will remain the sameas before, the overrunning of the iston 16 of the divided main ,ports 18 serving to keep sufiicient pressure in the port 32 and the front of the plunger-oha1nber to keep the plunger at the limit of its rearward movement against'the tension of its spring. 4

What I claim is 1. In an air-pres'ser-driVeri coal-cutting machine, a work cylinder, its piston, airpassages leading to the front and rear of the cylinder and a governor controlled by the movement of the piston for reducing the stroke of the said piston.

2. In an air-presserI-driven coal-cutting machine, a work-cylinder, its piston, airpassages leading to the front andrear of the cylinder and a governorcontrolled by the movement of the piston beyond its normal forward limit for automatically reducing the supply of air to the front of the piston for rc ducing its stroke.

ward limit for cutting off the main front port .to reduce the stroke of the piston.

5. In an air-presser-dr1ven' coal-cutting machine, a workcylinder, its piston, a rear port, a main front port, an auxiliary front port,and a governor for controlling the stroke of the piston comprising a plunger, its cylinder, a spring for yieldinglv holding the plunger in position to leave the main front port open and a port leading from the front of the work cylinder to the front of the plunger whereby the excessive forward movement of the piston will cause the air to force the plunger back into position to close the main front port and thus reduce the supply of air to the rout of the piston.

6. In an air-presser-driven coal-cutting machine, a work-cylinder, its piston, a rear port, a main front port, an auxiliary front port, a governor for controlling the stroke of the piston com rising a plunger, its cylinder, a spring for yie dingly holding the plunger in position to leave the main front port open, a ort leading from the front of the Work-cyllnder to the front of the plunger whereby the v excessive forward movement of the piston will cause the air to force the plunger back into position to close the main front port and thus reduce the supply of air to the front of the piston, and a governor-valve for partially olosin the plunger-controlling port for temporari y retaining air-pressure on the plunger irrespective of the position of the piston.

7. In an air-presser-driven coal-cutting machine, a work-cylinder, its piston, a valveehest divided into front and rear chambers, a rear port leading from the rear chamber to the rear of the Work-piston, a main front port leading from the front valve-chest chamber to the front ofthe piston at a distance from the end of the cylinder, an auxiliary front port leading from the front valve chest chamber to the front of the piston adjacent to the end of the cylinder, a s ring-actuated governorplunger located in t" e valve-chest normally in positionto leave the main front port open and a port leading from the front of thesaid plunger to the front end of the work-cylinder whereby the governor-plmv ger is moved rearwardly to close the main front port when the work-piston overruns the limit of its normal forward movement.

r 8. In an air-presser-driven coal-cutting the specification and claims the wor machine, a work-cylinder, its piston, a valve- ,ches't divided into front and rear chambers,

a rear port leading from the rear chamber to the rear of the work-piston 'a main front port leading from the front valve-chest chamber to the front of the iston at a distance from the end of the cylinder, an auxiliary front port leading from the front valve-chest chamber to the front of the piston adjacent to the end of the cylinder, a s ring-actuated governor-plunger located in t e valve-chest normally 1X1 position to leave the main front port open, a port leading from the front of the said plunger to the front end ofthe Workcylinder whereby the governor-plunger 1s 111 fpresenoe of two witnesses, tlns 13th day 0 November, 1905.

ARTHUR H. GIBSON.- -.Witnesses: I

FREDK. 'HAYNES,

HENRY THIEME,

It is hereby certified that in'Letters Patent No. 818,619, granted April 24, 1906,

; ment in Goal-Cutting Machines,-errors occur requiring correction, as follows:

; upon the application of Arthur H,Gi bson', of Easton, Pennsylvania, for an improvepresser "wherever it occurs should read pressor and the word pressers should read preasors; and that the said Letters Patent should be read case in the Patent Office.

with these corrections therein that the same may conform to the record of the Signed and sealed this 15th day of May, A. D., 1906.

[smart] F. I. ALLEN,

Commissioner of Patents.

the specification and claims the wor machine, a work-cylinder, its piston, a valve- ,ches't divided into front and rear chambers,

a rear port leading from the rear chamber to the rear of the work-piston 'a main front port leading from the front valve-chest chamber to the front of the iston at a distance from the end of the cylinder, an auxiliary front port leading from the front valve-chest chamber to the front of the piston adjacent to the end of the cylinder, a s ring-actuated governor-plunger located in t e valve-chest normally 1X1 position to leave the main front port open, a port leading from the front of the said plunger to the front end ofthe Workcylinder whereby the governor-plunger 1s 111 fpresenoe of two witnesses, tlns 13th day 0 November, 1905.

ARTHUR H. GIBSON.- -.Witnesses: I

FREDK. 'HAYNES,

HENRY THIEME,

It is hereby certified that in'Letters Patent No. 818,619, granted April 24, 1906,

; ment in Goal-Cutting Machines,-errors occur requiring correction, as follows:

; upon the application of Arthur H,Gi bson', of Easton, Pennsylvania, for an improvepresser "wherever it occurs should read pressor and the word pressers should read preasors; and that the said Letters Patent should be read case in the Patent Office.

with these corrections therein that the same may conform to the record of the Signed and sealed this 15th day of May, A. D., 1906.

[smart] F. I. ALLEN,

Commissioner of Patents. 

